Actuating means for magnetos



July 5 1927. n K A. C. KLECKNER ACTUATING MEANS Fon MAGNETos Filed July2. 1924 2 sheets-sheet 1 Jul 5 1927.

y A. c. KLECKNER ACTUATING MEANS FOR yMAGNETOS Filed July z. 1924 2Sheng-sheet 2' Patented July 5, 1927.

UNITED STATES 15.634584 PATENT OFFICE.

ARTHUR C. KLECKNER, OF RACINE, WISCONSIN, ASSGNOR '10 XVEBSTER ELECTRICCOMPANY, OF RACINE, WISCONSIN, A CORPORATION OF XVISCONSIN.

Ac'rUA'rING MEANS ron MAGNETos.

kApplication illed July 2, 1924, Serial Nm 723,801.

My invention relates to actuating means for magnetos of the oscillating`armature type, the chief purpose of the invention being to insure afull spark current at all engine speeds by generating the spark currenton 'the initial movement-fof the armature rather than on its recoilmovement. ther objects of my invention are the use of a trippingmechanism having a cooking feature combined therewith to produce a quickcurrent generating impulse; the yprovision of an improved form oftripping tinger, and the provision of improved means for locking thearmature until it is released for its current generating movement.y

In the usual form of oscillating magneto, the armature is brought to acocked position against spring pressure, and the armature then isallowed to snap back to its normal position, thev spark current beinggenerated on this quick recoil movement. It has been found, however,that athigh enginespeeds, the cooking or initial movement of thearmature is so fast and is followed so soon by the quick recoilmovement, that insufiicient opportunity is allowed for the currentnecessarilygenerated by this cooking movement to die out before thenewly created spark current onthe `recoil surges through the coils in 3the opposite direction. As a result, the spark current has to build11p-not y'trom a zero value-but from a value on the other sider of thezero line, corresponding to a cui`- rent flowin the opposite direction.`For this.

Il reason, the spark current cannot build upto as great a peak valueduring high engine speeds asfat slow or moderate speeds.

vI depart from this practice by using this initial oscillation of thearmature,. correspending to the cooking movement iny prior practice, forgenerating thespark current,

and use the recoil merely for returning the armature to its normalposition.

mature assumes between ring strokes ot the engine, and isof considerablylonger duration thanthe actuating period vof the mag.- neto. Thus, this,entire time. interval be-r tween the recoil movement of the armature forone engine cycle and ,thek initial movement of the armature fork thesucceeding engine cycle is allowed for any currents to die out beforethe spark current is generated.

The `foregoing and other objects are set forth more in detail in thefollowing de- Fur l This non' v mal position is they state of rest thatthe arscription of a magneto embodying a preferable adaptation oi theinvention, and are disclosed in the drawings, wherein y Figure 1 is aside elevation of a single cylinder internal combustion engine providedwith the magneto oi. my invention;

Figure 2 is a plan view of the magneto; Figures 3, 4, and 5 are verticaltransverse sections taken respectively on the lines 33, 4-4, and 5--5 ofFigure 2;

Figure 6 is a view similar to Figure 3, but showing the parts in theposition they assume at the completion of the tripping stroke; and n i'i y Figure 7'is a view .similary to Figure 3, but showing a modifiedi'orm of tripping finger.

The engine 10 shown in Figure 1 is provided with the usual reciprocatingvalve rod 11, the magneto 12 being secured to the engine casting bymeans of a bracket 13 on the magneto and so arranged that the stationaryand movable,,electrodes 14; and 15 extend through a suitable aperture inthe engine wall to the combustion chamber. A plurality of U-shapedmagnets 16 are superimposed and ttedtogether to it'orm a unit.v the vlegs of which are provided with opposed E-shaped pole pieces 17, themiddle bars 18 of the E-shaped pole pieces carrying the coils 19, inwhich the sparking current isgenerated. The end terminals of this pairof coils are connectedwith the electrodes 14 and 15. Between the poleypieces 17 is rotatably mountedan armature 21 having a substantiallyX-shaped cross section.

In the normal position shown in Figure 5,

' the magnetic path between the pole pieces leads through the middlebars 18 and across the opposed arms 22 of the armature. V'Vhen thearmature is given a short but quick clockwise rotation, the lines offorce along thispath are stretched and iinally abruptly broken as thearms 22 of the armature move out of proximity to the middle bars 18, andthe other arms23 of the armature, as well as the arms 22, close pathsthrough the upper and lower bars of the E-shaped pole pieces` As pointedout in the introduction to the specification, this currentv generatingmovement of the armature is made on the cooking or initialvmovement ofthe armature rather than on the recoil movement. The means for effectingthis sudden forward movement of the armature oscillation will now bedescribed.

The armatureslmft22 isextendethbeyond rod B9 `e'1i, g;agesy the end ofthe; push `finger its bearings at one end ofthe magneto and 28. -Asthe'lvalve'rod l-l in its reeiproeation there provided With a Camdise-Q'Tfthemoved-Ato the left, the elamp 37 Will cause funetioir ot'Whiehlushallepresentlydescribe: similarrinorveinentz ot' :the: tripvtingen 85, A. reeoil springris eoiledhabout;this,:shaftapressingthe'endv of. the push rod 3) against 22 having; one end securedby pin 25 to the push finger Q8. Because the armature the cam dise 2Tand the otherendasecuredfby is. locked.aagafnistfrotation by the rollers30, piu Q6 to the magneto frame. The tension the push rod Will yieldagainst the pressure of this spring' normally/'tends to 4return theA1ot' the" spring*- -(J luntil the forward extension armature to its.normal position indicated in 42 of the trip finger contactsv the pushiin- Fiaiure 5 and.thereyieldingly-hold iti""'l.`li`g gerQS.` Sinnethisestablishes a-pos' ire con-A arniature shaftfmis'alsoi'provideditlra; neetion-betweentheyalre rod and-'the push push.tingerQSgzwhieh I ,shallpiesentlyfldeif finger;Vv there is sutliei'entI`rotarytorce im-` seribe. As shownin Fig'ure, thezeanrrdise parted' tothearmature shaft-Q2 to cause 2T is providedwith:'diametrieallyropposedrthe5 rollers 'BO to ride out ot' the delnfessionsdepressions29intoWhiehf'itrolleis"30 'arA 29 against the yielding torre or thesprings ried on the endA of Aopposed'iplungieisel 33', freeing thearmaturerlfrom all meehani'eal slidably1 journalled in bearingsBQ`entend-ing resistance :to turningvr-)ther than the"inei rearwardly fromthe magneto AJframe: dentaldriction-ot thearinat'ure b ir-ings andCompression springs 33 are inserted bef the rollersO;E tween theouterfbearings-BQ and W'ashers'se- Itwill-be noted, however, that `bythe timesy cured to the plungeis 3l for urging the roll-V the"extensionl 42 contacts tlie push iingerQS." ers 30 radially against'theperiphery of the the lpush rod BQVWill have assumeda cocked camdise27... The forward or Cloelolvi'seendsH position?because-of theEcompression ofthe o1 thedepressionsQSareextendedoutwardly Spring 40.1*As 'soon as the eaindise 2T is asat Set to stopv thearmatureagainsticounterunloekedfpthe 'cocked' push r'od will 'shootclockwise rotation 'past 'the normalaposition forwardly eonsiderably'faster than the timed to which it is returned by theboiledspringtravel-'ofthe trip' iiigei'5-ii'ri1lia1fting a `quleli 24C. Tlile thedepresgions-QQJtend-to hold rotation to the armature: `Thearelthrouglrthe dise 27 Tagging@ -Cloekwise -1-0mti0n-1gr Whielrthe armature-is thusrotated may be predetermined torsional stliainon'thetarmaedetermined byadjustmentol the' cap 'sferen' ture shaft vWill cause the Vrollers to`ride-outl lsffwhichfas the Ypush linger-28 "IOl'vk of the depressions"29 "againsttheyielding" pushes the pushirodl-Q dou-inwardly andoutpressurept the springs` 33." I shall} next` of engagement With'thepushtinger. describeV 'the rmeans' employiorunloeking; At the propertime an arm it on ythe push and rotating the armature; fingfer'QSContacts' the* electrode arm i',fro

Disposed in horizontal 'alignment' with the;, tating fthe* electrodesha'lt 48. the opiliesite push linger28 is a trip-;'f i1iger"35piyp'te'd end^of which Carries `the inovable electrode at 36 'to d.Valve/fwd' Clamp-3,7 which is pig;` l5, pulling? the latter Vaway fromthe*sta` idly'lseeuredito .the Valvefrodl, as shown'- tionary-'eleetrode14 Or'v the purpose ot in Fig'ure l. LAn eceentricsleeye' may drawingout af'sparlfpas is usua-llin low ten-V be interposed between 'theVpivot 36 "and `thel sion' fmagneto equipment. trip finger 35. .'Bythe:operation vof arsuitf AS" soon Vas the pushirod- 39 swung,r out` ablehandle, notl shownthis*eccentricLsleeye. Of "Engagement with thepush-tiner the may be rotated't advance' or retard the spring 24 snapsthe armature"back` to fits spark. The tripting'er-B is proyidedlwithorigina-l positionuhere the rollers 30 'again alignedlongitu'dinally,disposed bearings38,` I lock the armature shaftagainst'rotation:' It Within which is ieeiproCa-lly1 journalledia; Will`tlius be seen that therecoil-movement et push rod 3.9,"Whiehis normallykiirgedjaway:i th Spring' `24e is not yutilized for;l any Current- Afrom'the pivotY 36 by a' eompression'spring' generatingpurposes7V but`merely to return1` l() Whiclrholdsthe shoulder4l of tlieA push."theiparts to their normal positionin readi-v rod against one of thebearingseS to limiti ness forit-he next oscillation: r The *entirerelative moyementpof thepush: rod andtrip" time intervalbetween therecoil' atioir ot' the" finger.`r The trip'tingerfis provided xvith'an.:spring` 24 and-the. trippingof thepushfiin#A extension :4Q Whielrnormall) yext-ends"'longi ger-28` in thezsuceeeding engiueeyele is althebottom ofya'ndzto withinI a short distancelow'ed',A duringWbiehf'timm-of courseg'all 'eure from the' end of. the. push r`od-39;.rent'generated'in the coils Willhave died'out."

The "push ingferQSis provzidedtwithanVVlienfthe 'armature'is againtripped, the` sparkfcurrent'will buildup from a: zero value; Wardlyextendingeapg'screw"44. A strongr and' n'otrom4 a' value! on 'the :otherside of looped springel disposed."about`4 the' pivot." the`zero"lin.

36 tendsto spring'the'triptiingen35 up-'; In Figure 7 I have shown amodiiedform" Wardlyso thatthe cap'selew'eti-.t4 contacts the' oftripnger, in Whieh'the positivelyxmoved upper surface' of the push"rbd-'39. As sh'owvn7 trip` finger 135" does not. itself Contact .the

in Figure 3, the forward edge of thepushMpush fmgerQS, but "positivelyengages "the 130 Les-1,584

push rod 39 after the latter has cocked the yielding spring 40. In itsdetailed construction, the push finger 35 is hollowed by a bore withinwhich reciprocates the rear end of the push rod 39', a positive stop forthe shoulder 41 on the push rod being afforded by a cap 49 threaded overthe open end of the push finger 35. The spring 40 is cocked while theshoulder 4l travels from the end of the cap 49 to the open end of thepush finger 35 which then positively pushes the push rod 39 forwardly totrip the armature.

Having thus described my invention, what I claim is:

1. The combination with a magneto having an armature rotatably mountedtherein and a winding therefor, forward and also backward rotation ofwhich armature gen-- erates a current in said winding, of a pair ofelectrodes, a push finger on said armature, a trip finger, means formoving said trip iinger, a spring pressed latch for locking saidarmature in a normal position, a push finger engaging element movablymounted on said trip finger, a spring disposed between said element andsaid trip finger adapted to be cocked by movement of sald trip finger,said ktrip finger after said spring is cocked moving said push finger tounlock said armature and permit said spring to snap said element forrotating said armature forwardly,

means for returning said armature to its normal position, and means forutilizing the current generated in sa1d wlndin on sa1d forward rotationto produce a spar between` said electrodes.

2. The combination with a magneto having a winding and a rotatablymounted armature, of means for oscillating said armature comprising adriving element having a timed movement, an impulse .mechanisminterposed between said element and said armature for rotating thelatter forwardly, means for rotating said armature back- Wardly to anormal osition, and a. spring pressed latch for releasably locking saidarmature in normal position.

3. Means for actuating the armature of an oscillating armature magnetocomprising a spring for bringing said armature to a normal position, acam disc having depressions therein and secured to said armature, springpressed means engaging said depressions when said armature is in normalposition, a timed driving element, and an impulse mechanism between saidelement and said armature for rotating said armature forwardly againstthe force ot said spring.

4. The combination with a magneto having a rotatably mounted oscillatingarmature, of a driving element having a timed movement, a push arm onsaid armature, a trip finger mounted on said element, a push rodslidably supported on said finger for engaging said push arm, a springbetween said rod and said finger, a cam disc having locking shouldersthereon, a spring pressed roller engaging between said shoulders forholding said armature against rotation to cock said spring, means onsaid finger for unlocking said locking` means, and a spring to returnsaid armature to a normal position.

5. In an oscillatory magneto, the combination of a rotary armaturehaving a normal position between firing strokes of the engine, a groovedcam disc fixed. to rotate with said armature and a resilient rollerengaging in the groove of said disc to lock said armature in normalposition, a pair of circuit controlling lmembers, mechanism forimparting a current generating impulse to said armature in its initialoscillation away from said normal position, and means for separatingsaid circuit controlling members during said initial oscillation. i

6. In an oscillatory magneto, the combination of a rotary armaturehaving a normal position, resilient means to lock said armature innormal position, camming means to cam said resilient means out oflocking position, a pair of circuit controlling members, means foroscillating said armature away from said normal position, means foroscillating said armature back to said normal position, and means forseparating said circuit controlling members during the oscillation ofsaid armature away from said normal position.

In witness whereof, I hereunto subscribe my name this 17th day of May,1924.

ARTHUR C. KLECKNER.

